"Expertise" === "nuanced understanding" E.g.: Lighthouse has major throttling challenges today, and that to get a real understanding of real-world perf, must run on actual hardware target... ...which is why http://webpagetest.org/easy is your friend https://twitter.com/aweary/status/1166805797231153153 …
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These are complex interactions! Tools like Lighthouse provide _visibility_ to what was previously invisible. But they are not talismans. Saying "X gets 100 on LH" is specifically meaningful, but only when quantified (which hardware? which test environment? where in the network?)
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And, as a statement about success over time, "X gets 100 on LH" is functionally meaningless. The important question is: in projects where X is involved, what's the probability of a good LH score over the project's lifespan (again, situated in network/device/topology).
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Many a disappointed partner team has enthusiastically told me about their super-fast starting-point. Then we put the real site on the bench, with real hardware, with real link conditioning. Turns out, point-in-time visibility isn't worth very much if you don't keep looking.
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